I posted a similar message about my experience with the PResonus EQ 3B on the Where ES Shines thread.

I did not know much of anything about parametric EQ until I saw and read the study that dutchpicker (? my apologies if incorrect) wrote in an AGF post last August or September. I could not afford a K4.

When I got the Presonus I started out by setting the EQ to match as best I could the graph in his thread. Then I played while a friend listened and together we tweaked the sound. Did a similar thing at the first venue we played...but did not need to change anything; if a K4 sounds any better it is worth the price.

My experience has been good so far. I had a false start after I had calculated all the needed dial settings based on the EQ curves from that other thread, based on the manual for the EQ3B. Then I realized that the bands on my unit are different than shown in manual (ie. my low is actually 20Hz-300Hz...not 20Hz-800Hz as shown in manual). Once I realized that the face dial (ranges for 3 bands) in the manual did not match mine...I was able to get a very natural tone through headphones and my ultrasound amp. I have used it through PA at church (yesterday) but I was not able to do any testing or evaluation in the rush to ready for our service.

I will post my settings later so others can compare. If you have your settings...that you like best...please post them.

This is a nice little unit, and I did A/B comparison with my other 7 band stompbox EQ (very noisy in comparison) and Boss unit with 4 band (bass, mid, treble, presence) also noisy in comparison and much less control.